package org.kl.bf.utils;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

/**
 * 在ApplicationContext环境外获取bean的工具类.
 */
public class ApplicationContextHelper implements ApplicationContextAware {
	/**
	 * 向ApplicationContextHolder里设置ApplicationContext.
	 * 
	 * @param applicationContext
	 *            applicationContext
	 */
	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
		ApplicationContextHolder.getInstance().setApplicationContext(applicationContext);
	}

	/**
	 * 获得ApplicationContext.
	 * 
	 * @return ApplicationContext
	 */
	public static ApplicationContext getApplicationContext() {
		return ApplicationContextHolder.getInstance().getApplicationContext();
	}

	/**
	 * 根据class获得bean.
	 * 
	 * @param clz
	 *            Class
	 * @return T
	 */
	public static <T> T getBean(Class<T> clz) {
		return ApplicationContextHolder.getInstance().getApplicationContext().getBean(clz);
	}

	/**
	 * 根据id获得bean.
	 * 
	 * @param id
	 *            String
	 * @return T
	 */
	@SuppressWarnings("unchecked")
	public static <T> T getBean(String id) {
		return (T) ApplicationContextHolder.getInstance().getApplicationContext().getBean(id);
	}
}
